Display method of electronic device

ABSTRACT

A display method of an electronic device includes following steps. Providing a first image by a display, and a first vergence plane of two eyes of a user is located at a first position when the user views the first image. Providing a second image by the display, and the first image, the second image and an environmental scene are located within a field of view of the user, and a second vergence plane of the two eyes of the user is located at a second position when the user views the second image. A first distance exists between the first position of the first vergence plane and the user, a second distance exists between the second position of the second vergence plane and the user, and the first distance is different from the second distance.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. application Ser.No. 17/495,829, filed on Oct. 7, 2021, which claims the benefit of U.S.Provisional Application No. 63/109,873, filed on Nov. 5, 2020. Thecontents of these applications are incorporated herein by reference.

BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure

The present disclosure relates to a display method of an image and adisplay method of an electronic device, and more particularly to adisplay method of an image and a display method of an electronic deviceof the augmented reality technology.

2. Description of the Prior Art

The augmented reality (AR) display technology has been widely used invarious fields. This technology can display images with the scenes inreal environment. However, in current image display methods, the imageand the scene of the real environment cannot be effectively superimposedwhen the user is viewing, resulting in blurred image or blurred scene ofthe real environment. Therefore, there is a need to provide an improvedscheme for the display method of augmented reality.

SUMMARY OF THE DISCLOSURE

An embodiment of the present disclosure provides a display method of anelectronic device including following steps. Providing a first image bya display, and a first vergence plane of two eyes of a user is locatedat a first position when the user views the first image. Providing asecond image by the display, and the first image, the second image andan environmental scene are located within a field of view of the user,and a second vergence plane of the two eyes of the user is located at asecond position when the user views the second image. A first distanceexists between the first position of the first vergence plane and theuser, a second distance exists between the second position of the secondvergence plane and the user, and the first distance is different fromthe second distance.

An embodiment of the present disclosure provides a display method of animage, which comprises the following steps. Providing a display, thedisplay provides a first image, and the first image and an environmentalscene are located within a field of view of a user. A first vergenceplane of two eyes of the user is located at a first position when theuser views the first image, and a second vergence plane of the two eyesis located at a second position when the user views an object in theenvironmental scene. A first distance exists between the first positionof the first vergence plane and the user, a second distance existsbetween the second position of the second vergence plane and the user,and the first distance and the second distance satisfy a first relation:Dn<D1<Df, wherein D1 represents the first distance, Dn=D2+Δn, andDf=D2+Δf, wherein D2 represents the second distance,Δn=(De/2)*{tan[tan⁻¹(2*D2/De)−δ]}−D2, andΔf=(De/2)*{tan[tan⁻¹(2*D2/De)+δ]}−D2, and wherein De represents adistance between the two eyes, δ represents an eye angular resolution ofthe two eyes, and δ=0.02 degrees.

These and other objectives of the present disclosure will no doubtbecome obvious to those of ordinary skill in the art after reading thefollowing detailed description of the embodiment that is illustrated inthe various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of an electronic device according to afirst embodiment of the present disclosure.

FIG. 2 is a schematic diagram of the comparison of different userviewing states.

FIG. 3 is a schematic diagram of a relationship of positions of vergenceplanes of two eyes of a user viewing an image and an environmentalscene.

FIG. 4 is a schematic diagram of adjusting a position of a vergenceplane of two eyes according to the present disclosure.

FIG. 5 is a schematic diagram of a relationship of positions of avergence plane of two eyes and an accommodation plane of one eye when auser views an image.

FIG. 6 is a schematic diagram of a user viewing an image according to asecond embodiment of the present disclosure.

FIG. 7 is a schematic diagram of a user viewing state according to thesecond embodiment of the present disclosure.

FIG. 8 is a schematic diagram of a user viewing an image according to athird embodiment of the present disclosure.

FIG. 9 is a schematic diagram of a user viewing state according to afourth embodiment of the present disclosure.

FIG. 10 is a schematic diagram of adjusting a position of anaccommodation plane of one eye according to the present disclosure.

DETAILED DESCRIPTION

The present disclosure may be understood by reference to the followingdetailed description, taken in conjunction with the drawings asdescribed below. It is noted that, for purposes of illustrative clarityand being easily understood by the readers, various drawings of thisdisclosure show a portion of the electronic device, and certaincomponents in various drawings may not be drawn to scale. In addition,the number and dimension of each element shown in drawings are onlyillustrative and are not intended to limit the scope of the presentdisclosure.

Certain terms are used throughout the description and following claimsto refer to particular components. As one skilled in the art willunderstand, electronic equipment manufacturers may refer to a componentby different names. This document does not intend to distinguish betweencomponents that differ in name but not function. In the followingdescription and in the claims, the terms “include” and “comprise” areused in an open-ended fashion, and thus should be interpreted to mean“include, but not limited to . . . ”.

In addition, when an element is referred to as being “directly on”,“directly disposed on”, “directly connected to”, or “directly coupledto” another element or layer, there are no intervening elements orlayers presented.

The electrical connection may be direct connection or indirectconnection. When two elements are electrically connected, the electricalsignals may be transmitted by direct contact, and there are no otherelements presented between the two elements. When two elements areelectrically connected, the electrical signals may be transmittedthrough the intermediate element bridging the two elements. The term“electrically connecting” may also be referred to as “coupling”.

Although terms such as first, second, third, etc., may be used todescribe diverse constituent elements, such constituent elements are notlimited by the terms. The terms are used only to discriminate aconstituent element from other constituent elements in thespecification. The claims may not use the same terms, but instead mayuse the terms first, second, third, etc. with respect to the order inwhich an element is claimed. Accordingly, in the following description,a first constituent element may be a second constituent element in aclaim.

It should be noted that the technical features in different embodimentsdescribed in the following can be replaced, recombined, or mixed withone another to constitute another embodiment without departing from thespirit of the present disclosure.

The electronic device of the present disclosure may include a displaydevice, but not limited herein. The display device may include a touchdisplay, a curved display or a free shape display, but not limitedherein. The display device may be a bendable or flexible display device.The display device may include light-emitting diodes, liquid crystal,fluorescence, phosphors, other suitable display media or combinations ofthe above, but not limited herein. The light-emitting diodes may, forexample, include organic light-emitting diodes (OLEDs), inorganiclight-emitting diodes (LEDs), mini-light-emitting diodes (mini LEDs,millimeter sized LEDs), micro-light-emitting diodes (micro-LEDs,micrometer sized LEDs), quantum dots (QDs) light-emitting diodes (e.g.QLEDs or QDLEDs), other suitable light-emitting diodes or anycombination of the above, but not limited herein. The concept orprinciple of the present disclosure may also be applied tonon-self-emissive liquid crystal display (LCD), but not limited herein.

The display device may be any combination of the devices describe above,but not limited herein. In addition, the appearance of the displaydevice may be rectangular, circular, polygonal, a shape with curvededges or other suitable shapes. The electronic device may have externalsystems such as a driving system, a control system, a light sourcesystem, a shelf system, etc. to support a display device.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of an electronicdevice according to a first embodiment of the present disclosure. Theelectronic device 10 may be, for example, an augmented reality (AR)system or other types of three-dimensional image display systems, butnot limited herein. For example, the electronic device 10 of thisembodiment is applied to a vehicle as an example, but the application ofthe electronic device 10 of the present disclosure is not limitedherein. In other embodiments, the augmented reality system may also beapplied to glasses, but not limited herein.

As shown in FIG. 1, the electronic device 10 may include a display 100,an optical element 104 and a controller 108, but not limited herein. Theelectronic device 10 may also selectively include a sensing element 106and a sensing element 110, but not limited herein. The controller 108may be coupled to the display 100, the optical element 104, the sensingelement 106 and the sensing element 110.

The display 100 may provide an image. The image may be projected onto aglass 112 (such as a windshield) through the optical element 104, theimage may form an image V1 (also referred to as a first image) on avirtual image plane Pi outside the glass 112, and two eyes of a user(such as an eye 1021 and an eye 1023) may view the image V1 through theglass 112. Therefore, the image V1 outside the glass 112 and anenvironmental scene may be located within a field of view (FOV) of theuser. In addition, the display 100 may provide a left-eye image for theeye 1021 and a right-eye image for the eye 1023, and an offset existsbetween the left-eye image and the right-eye image, so that the image V1finally viewed by the user is a three-dimensional image, but not limitedherein. In addition, the electronic device 10 of this embodiment mayproject single image V1 onto one virtual image plane Pi, but not limitedherein.

Please refer to FIG. 2. FIG. 2 is a schematic diagram of the comparisonof different user viewing states. An example (i) is a state that theuser viewing one or more objects in the environmental scene, an example(ii) is a user viewing state of the conventional augmented realitysystem, and an example (iii) is a user viewing state using the displaymethod of image of this embodiment. In FIG. 2, a first object (such asroads, pedestrians, etc.) in the environmental scene may be located onan image plane Pr, and the image generated by the augmented realitysystem may be located on a virtual image plane Pi. In the example (i),the sight lines of the two eyes (such as the eye 1021 and the eye 1023)converge on the image plane Pr, and one eye (such as the eye 1021 or theeye 1023) also focuses on the image plane Pr when the user views thefirst object in the environmental scene. In other words, in the example(i), the positions of the vergence plane Pvr of the two eyes, theaccommodation plane Par of the single eye and the image plane Pr of thefirst object in the environmental scene are the same. However, in theexample (i), as shown by a dashed frame X, the image of the displayviewed by the user is blurred while the user is viewing the first objectin the environmental scene.

In the example (ii), an image Vx provided by the conventional augmentedreality system may be located on the virtual image plane Pi. The sightlines of the two eyes converge on the virtual image plane Pi, and thesingle eye also focuses on the virtual image plane Pi when the userviews the image Vx. In other words, in the example (ii), the positionsof the vergence plane Pvx of the two eyes, the accommodation plane Paxof the single eye and the virtual image plane Pi of the image Vx are thesame. However, in the example (ii), as shown by a dashed frame Y, thefirst object in the environmental scene within the dashed frame Y viewedby the user is blurred while the user is viewing the image Vx.

However, when the image Vx provided by the augmented reality system isused to mark the first object in the environmental scene, due to thedifference in the positions of the vergence planes of the two eyes, theuser may not clearly view the image Vx of the augmented reality systemand the first object in the environmental scene at the same time, or theuser may feel uncomfortable. Therefore, in the display method of theimage of the present disclosure, the drawbacks exist in the conventionalaugmented reality system may be lessened by adjusting the position ofthe vergence plane of the two eyes when the user views the augmentedreality image V1.

As shown in the example (iii) of FIG. 2, in the display method of theimage of this embodiment, a vergence plane Pv1 (also referred to as afirst vergence plane) where the sight lines of the two eyes of the userconverge may be located at a first position when the two eyes of theuser views the image V1, and a distance D1 (also referred to as a firstdistance) exists between the first position of the vergence plane Pv1and the user. Furthermore, a vergence plane Pv2 (also referred to as asecond vergence plane) where the sight lines of the two eyes of the userconverge may be located at a second position when the user views thefirst object in the environmental scene, and a distance D2 (alsoreferred to as a first distance) exists between the second position ofthe vergence plane Pv2 and the user.

In addition, please refer to FIG. 3. FIG. 3 is a schematic diagram of arelationship of positions of vergence planes of two eyes of a userviewing an image and an environmental scene. The distance Di in FIG. 3may be the distance D1 between the vergence plane Pv1 of the two eyesand the user when the user views the image V1, and the distance Dr inFIG. 3 may be the distance D2 between the vergence plane Pv2 of the twoeyes and the user when the user views the first object in theenvironmental scene. As shown in FIG. 3, the distance D1 and thedistance Dr may have a range R1, and the distance D1 and the distance D2may fall within the range R1. The user may clearly view the image V1 andthe first object in the environmental scene at the same time, or mayeffectively reduce user's uncomfortable feeling when the distance D1 andthe distance D2 fall within the range R1.

The distance D1 and the distance D2 may satisfy a first relation:Dn<D1<Df when the distance D1 and the distance D2 fall within the rangeR1. The lower limit distance Dn=D2+Δn, and the lower limit distance Dn(as shown in FIG. 3) may be the shortest distance Di that the user canclearly view the image V1 and the first object in the environmentalscene at the same time. The upper limit distance Df=D2+Δf, and the upperlimit distance Df (as shown in FIG. 3) may be the farthest distance Dithat the user can clearly view the image V1 and the first object in theenvironmental scene at the same time. In addition,Δn=(De/2)*{tan[tan⁻¹(2*D2/De)− δ] }− D2, andΔf=(De/2)*{tan[tan⁻¹(2*D2/De)+δ]}− D2. Furthermore, De represents adistance between the two eyes (such as a distance De between the eye1021 and the eye 1023 in FIG. 2), δ represents an eye angular resolutionof the two eyes, and δ=0.02 degrees.

The method of adjusting the position of the vergence plane Pv1 of thetwo eyes when the user is viewing the augmented reality image V1 in thepresent disclosure will be described in the following. Please refer toFIG. 4. FIG. 4 is a schematic diagram of adjusting a position of avergence plane of two eyes according to the present disclosure. Inaddition, in order to simplify the drawing, the optical element 104 andthe glass 112 in FIG. 1 are omitted in FIG. 4.

In an example of FIG. 4, a sub-pixel Pxa of the display 100 may emit alight beam La1 to the eye 1021, a sub-pixel Pxb of the display 100 mayemit a light beam La2 to the eye 1023, and the light beam La1 and thelight beam La2 may intersect at a vergence point Vt1. Based on the aboveprinciple, each picture may be displayed by one or a plurality ofcorresponding sub-pixels, and different pictures may be displayed bydifferent sub-pixels. The eye 1021 may view the picture represented bythe light beam La1, and the eye 1023 may view the picture represented bythe light beam La2. An offset may be included between the picturesrepresented by the light beam La1 and the light beam La2 throughdisplaying the pictures represented by the light beam La1 and the lightbeam La2 by different sub-pixels, thereby converging the two eyes at thevergence point Vt1.

In another example of FIG. 4, a sub-pixel Pxc of the display 100 mayemit a light beam La3 to the eye 1021, a sub-pixel Pxd of the display100 may emit a light beam La4 to the eye 1023, and the light beam La3and the light beam La4 may intersect at a vergence point Vt2. The eye1021 may view the picture represented by the light beam La3, and the eye1023 may view the picture represented by the light beam La4. An offsetmay be included between the pictures represented by the light beam La3and the light beam La4 through displaying the pictures represented bythe light beam La3 and the light beam La4 by different sub-pixels,thereby converging the two eyes at the vergence point Vt2, and theposition of the vergence point Vt2 may be different from the position ofthe vergence point Vt1. Therefore, the position of the vergence plane ofthe two eyes may be adjusted through providing pictures to the eye 1021and the eye 1023 by different sub-pixels.

Please refer to FIG. 2. In the conventional augmented reality system ofthe example (ii), the position of the vergence plane Pvx of the two eyesand the position of the image Vx are the same when the user views theimage Vx. However, as shown in the example (iii) in FIG. 2, comparedwith the conventional augmented reality system, the first position ofthe vergence plane Pv1 may be different from a third position of theimage V1 since the first position of the vergence plane Pv1 may beadjusted in the display method of the image of this embodiment.

On the other hand, as shown in the example (iii) in FIG. 2, in thedisplay method of the image of this embodiment, one eye (such as the eye1021 or the eye 1023) of the user may focus on an accommodation planePa1 (also referred to as a first accommodation plane) when the one eyeof the user views the image V1, and a fourth position of theaccommodation plane Pa1 is the same as the third position of the imageV1, but not limited herein. In addition, a distance D3 (also referred toas a third distance) exists between the fourth position of theaccommodation plane Pa1 and the user.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of a relationshipof positions of a vergence plane of two eyes and an accommodation planeof one eye when a user views the image V1. The distance Di in FIG. 5 maybe the distance D1 between the vergence plane Pv1 of the two eyes andthe user when the user views the image V1, and the distance Da in FIG. 5may be the distance D3 between the accommodation plane Pa1 of the oneeye and the user when the user views the image V1. As shown in FIG. 5,the distance D1 and the distance Da may have a range R2, and thedistance D1 and the distance D3 may fall within the range R2. Thedistance difference between the position of the accommodation plane Pa1and the position of the vergence plane Pv1 may be reduced when thedistance D1 and the distance D3 fall within the range R2, therebyreducing the discomfort of the user caused by the vergence-accommodationconflict.

When the distance D1 and the distance D3 fall within the range R2, thedistance D1 and the distance D3 may satisfy a second relation as below:

D3+(D1/1.3052−0.2657*D1)<Δd1<D3−(D1/1.1286+0.442*D1)

A distance difference Δd1 exists between the distance D1 and thedistance D3. The uncomfortable feeling of the user caused by thevergence-accommodation conflict may be mitigated when the distancedifference Δd1 satisfies the second relation. In addition, in someembodiments, the second relation may be: 0≤Δd1<D3−(D1/1.1286+0.442*D1).

The display 100 may include light emitting diodes, liquid crystal,fluorescence, phosphors, other suitable display media or combinations ofthe above, but not limited herein. The light emitting diodes mayinclude, for example, organic light-emitting diodes (OLEDs), inorganiclight-emitting diodes (LEDs), mini-light-emitting diodes (Mini LEDs),micro-light-emitting diodes (micro-LEDs), quantum dots (QDs)light-emitting diodes (such as QLEDs or QDLEDs), other suitablematerials or any combinations of the above, but not limited herein. Thedisplay 100 may also be a bendable or flexible electronic device. Inaddition, as shown in FIG. 4, the surface of the display 100 may includea plurality of lenses 112, and the lenses 112 may have different shapesaccording to different optical requirements, but not limited herein.

The optical element 104 may include a mirror, a lens or combinations ofthe above, but not limited herein. The optical element 104 may includean image surface shift system, but not limited herein. The image surfaceshift system may include a projector system, a light filed technologyelement, a folding light path element, or combinations of the above, butnote limited herein. The projection system may include a lens projector,a mirror or combinations of the above, but not limited herein. The lightfiled technology element may include a holographic optical element(HOE), an integral image element or combinations of the above, but notlimited herein. The folding light path element may include amulti-mirror and space element, but not limited herein.

The glass 112 may include a windshield, but not limited herein. Theglass 112 may be wedge type, flat type, curve type or combinations ofthe above, but not limited herein. A thin film may also be disposed onthe glass 112, but not limited herein.

The sensing element 106 may include an eye tracking sensor, a headtracking sensor, a feature tracking sensor or combinations of the above,but not limited herein.

The sensing element 110 may include an environment sensor, but notlimited herein. The sensing element 110 may include a camera, a lightfield camera, a structure light camera, a feature detector, a lidar, aradar or combinations of the above, but not limited herein.

The controller 108 may include programmable programming to executealgorithm processing, which may include, for example, a centralprocessing unit (CPU), a system on chip (SoC), an application specificintegrated circuit (ASIC), etc., but not limited herein. For example,the controller 108 may receive the information obtained by the sensingelement 106 and the sensing element 110, such as the street views,pedestrians, the eye information of the user, etc. Based on thisinformation, the controller 108 may obtain the image information for thedisplay 100 through the algorithm calculation. The controller 108 maytransmit the display data including the image information to the display100, and the display 100 may provide the image V1 according to thedisplay data, thereby realizing the display method of the image of thepresent disclosure.

Other embodiments of the present disclosure will be disclosed in thefollowing. In order to simplify the illustration, the same elements inthe following would be labeled with the same symbol. For clearly showingthe differences between various embodiments, the differences betweendifferent embodiments are described in detail below, and repeatedfeatures will not be described redundantly. In addition, theses repeatedfeatures may be applied in various embodiments in the following.

Please refer to FIG. 6 and FIG. 7. FIG. 6 is a schematic diagram of auser viewing an image according to a second embodiment of the presentdisclosure. FIG. 7 is a schematic diagram of a user viewing stateaccording to the second embodiment of the present disclosure. In someembodiments, the display 100 of the electronic device 10 may provide aplurality of images. As shown in FIG. 6, the display 100 may alsoprovide an image V2 (also referred to as a second image) in addition tothe image V1, and the image V2 may be located on a virtual image planePj. The position of the virtual image plane Pj may be different from theposition of the virtual image plane Pi, so the position of the image V2may be different from the position of the image V1. The two eyes of theuser may view the image V2 through the glass 112, and the image V2 andthe environmental scene may exist within the field of view of the user.

As shown in FIG. 7, a vergence plane Pv3 (also referred to as a thirdvergence plane) of the two eyes of the user is located at a fifthposition when the user views the image V2, and the fifth position of thevergence plane Pv3 is different from the first position of the vergenceplane Pv1 (as shown in FIG. 2). A vergence plane Pv4 (also referred toas a fourth vergence plane) of the two eyes is located at a sixthposition when the user views a second object in the environmental scene.The positions of the first object and the second object in theenvironmental scene may be different, and the sixth position of thevergence plane Pv4 in FIG. 7 is different from the second position ofthe vergence plane Pv2 in FIG. 2. In addition, a distance D4 (alsoreferred to as a fourth distance) exists between the fifth position ofthe vergence plane Pv3 and the user, and a distance D5 (also referred toas a fifth distance) exists between the sixth position of the vergenceplane Pv4 and the user.

For making the user clearly view the image V2 and the second object inthe environmental scene at the same time, or for effectively reducinguser's uncomfortable feeling, the distance D4 and the distance D5 mayalso fall within the range R1 in FIG. 3. In this condition, the distanceDi in FIG. 3 may be the distance D4 between the vergence plane Pv3 ofthe two eyes and the user when the user views the image V2, and thedistance Dr in FIG. 3 may be the distance D5 between the vergence planePv4 of the two eyes and the user when the user views the second objectin the environmental scene. The distance D4 and the distance D5 maysatisfy a third relation: Ds<D4<Dt when the distance D4 and the distanceD5 fall within the range R1 of FIG. 3.

In the third relation, The lower limit distance Ds=D5+Δs, and the lowerlimit distance Ds (as shown in FIG. 3) may be the shortest distance Dithat the user can clearly view the image V2 and the second object in theenvironmental scene at the same time. The upper limit distance Dt=D5+Δt,and the upper limit distance Dt (as shown in FIG. 3) may be the farthestdistance Di that the user can clearly view the image V2 and the secondobject in the environmental scene at the same time. In addition,Δs=(De/2)*{tan[tan⁻¹(2*D5/De)− δ]}− D5, andΔt=(De/2)*{tan[tan⁻¹(2*D5/De)+δ]}− D5. Furthermore, De represents adistance between the two eyes (such as a distance De between the eye1021 and the eye 1023 in FIG. 2), δ represents an eye angular resolutionof the two eyes, and δ=0.02 degrees.

Therefore, when the environmental scene includes the first object andthe second object, and the distance between the first object and theuser is different from the distance between the second object and theuser, the electronic device 10 may provide the image V1 corresponding tothe first object and the image V2 corresponding to the second object. Inaddition, the user may clearly view the image V1 and the first object inthe environmental scene at the same time, or clearly view the image V2and the second object in the environmental scene at the same time byadjusting the positions of the vergence planes of the two eyes when theuser is viewing the augmented reality image V1 and the augmented realityimage V2 through the display method of the image of this embodiment.

On the other hand, one eye (such as the eye 1021 or the eye 1023) of theuser focuses on an accommodation plane Pa2 (also referred to as a secondaccommodation plane) when the one eye of the user views the image V2,and a seventh position of the accommodation plane Pa2 is the same as theposition of the image V2. Since the position of the image V2 isdifferent from the position of the image V1 (as shown in FIG. 6), theseventh position of the accommodation plane Pa2 (as shown in FIG. 7) isalso different from the fourth position of the accommodation plane Pa1(as shown in FIG. 2). In addition, a distance D6 (also referred to as asixth distance) exists between the seventh position of the accommodationplane Pa2 and the user.

For mitigating the discomfort of the user caused by thevergence-accommodation conflict, the distance D4 and the distance D6 mayalso fall within the range R2 in FIG. 5. In this condition, the distanceDi in FIG. 5 may be the distance D4 between the vergence plane Pv3 ofthe two eyes and the user when the user views the image V2, and thedistance Da in FIG. 5 may be the distance D6 between the accommodationplane Pa2 of the one eye and the user when the user views the image V2.When the distance D4 and the distance D6 fall within the range R2 ofFIG. 5, the distance D4 and the distance D6 may satisfy a fourthrelation as below:

D6+(D4/1.3052−0.2657*D4)<Δd2<D6−(D4/1.1286+0.442*D4)

A distance difference Δd2 exists between the distance D4 and thedistance D6. In addition, in some embodiments, the fourth relation maybe: 0≤Δd2<D6−(D4/1.1286+0.442*D4).

In some embodiments, the image V1 and the imager V2 may be displayed bydifferent regions of the display 100. As shown in FIG. 4, the image V1and the image V2 may be displayed by sub-pixels in different regions ofthe display 100, so that the user may have different vergence planes(such as the vergence point Vt1 and the vergence point Vt2) when theuser views the image V1 and the image V2, but limited herein. In someembodiments, the display 100 may provide the image V1 at a first timepoint and the image V2 at a second time point, and the first time pointis different from the second time point, but not limited herein. Themethod described above may make the positions of the vergence planes ofthe two eyes the user different when the user views the image V1 and theimage V2, or make the positions of the accommodation planes of the oneeye of the user different when the user views the image V1 and the V2,and the method of adjusting the positions of the accommodation planesmay be referred to the subsequent FIG. 10.

Please refer to FIG. 8. FIG. 8 is a schematic diagram of a user viewingan image according to a third embodiment of the present disclosure. Insome embodiments (as shown in FIG. 8), the display 100 of the electronicdevice 10 may provide an image V3, the image V3 may be located on avirtual image plane Pk, and the distances between the user and differentportions of the image V3 or different portions of the virtual imageplane Pk may be different. For example, the image V3 may includedifferent image contents displayed by different regions (or sub-pixels)of the display 100, and the user may have vergence planes of the twoeyes or the accommodation planes of the one eye at different distanceswhen the user views these different image contents, but not limitedherein. In addition, the vergence planes of the two eyes and differentobjects in the environmental scene may satisfy the range R1 in FIG. 3,or the vergence planes of the two eyes and the accommodation planes ofthe one eye may satisfy the range R2 in FIG. 5. Therefore, the user mayclearly view different image contents and different objects in theenvironmental scene at the same time, or the discomfort of the usercaused by the vergence-accommodation conflict may be mitigated.

Please refer to FIG. 9. FIG. 9 is a schematic diagram of a user viewingstate according to a fourth embodiment of the present disclosure. Insome embodiments, the position of the accommodation plane Pa1 may befurther adjusted in the display method of the image when the distance D1between the vergence plane Pv1 of the two eyes and the user and thedistance D3 between the accommodation plane Pa1 of the one eye and theuser fall outside the range R2 in FIG. 5, or when the distancedifference between the position of the accommodation plane Pa1 and theposition of the vergence plane Pv1 needs to be reduced to furthermitigate the discomfort of the user caused by the visualvergence-accommodation conflict.

Different from the first embodiment (as shown in the example (iii) ofFIG. 2), in this embodiment (as shown in FIG. 9), one eye (such as theeye 1021 or the eye 1023) of the user focuses on the accommodation planePa1 when the one eye of the user views the image V1, the fourth positionof the accommodation plane Pa1 may be different from the third positionof the image V1, and the fourth position of the accommodation plane Pa1may also be different from the first position of the vergence plane Pv1.Therefore, the fourth position of the accommodation plane Pa1 may becloser to the first position of the vergence plane Pv1, and the distancedifference Δd1 between the distance D1 and the distance D3 may befurther reduced.

The method of adjusting the accommodation position of one eye in thisembodiment will be described in the following. Please refer to FIG. 10.FIG. 10 is a schematic diagram of adjusting a position of anaccommodation plane of one eye according to the present disclosure. Theeye 1021 is used as an example in FIG. 10, but this method may also beapplied to the eye 1023. In addition, in order to simplify the drawing,the optical element 104 and the glass 112 in FIG. 1 are omitted in FIG.10.

In the example (i) of FIG. 10, a sub-pixel Px1, a sub-pixel Px2, asub-pixel Px3, a sub-pixel Px4, a sub-pixel Px5, a sub-pixel Px6 and asub-pixel Px7 of the display 100 may respectively emit a light beam Lb1,a light beam Lb2, a light beam Lb3, a light beam Lb4, a light beam Lb5,a light beam Lb6 and a light beam Lb7 to a view point VP1, a view pointVp2, a view point Vp3, a view point Vp4, a view point Vp5, a view pointVp6 and a view point Vp7 on a plane Pe where the eye 1021 is located.The light beam Lb1, the light beam Lb2, the light beam Lb3, the lightbeam Lb4, the light beam Lb5, the light beam Lb6 and the light beam Lb7may focus on an accommodation point Ap1.

Furthermore, the light beam Lb3, the light beam Lb4 and the light beamLb5 emitted by the sub-pixel Px3, the sub-pixel Px4 and the sub-pixelPx5 may enter a pupil 114 of the eye 1021 in different view directions.In other words, the eye 1021 may view the light beam Lb3, the light beamLb4 and the light beam Lb5 emitted by different sub-pixels at the sametime. Based on the above principle, each light beam may respectivelyrepresent a picture, each picture may be displayed by one or a pluralityof corresponding sub-pixels, and different pictures may be displayed bydifferent sub-pixels. For example, an image provided by the display 100may include the pictures represented by the light beam Lb1 to the lightbeam Lb7 at the same time, and the eye 1021 may view the picturesrepresented by the light beam Lb3, the light beam Lb4 and the light beamLb5 at the same time. Offsets included between the pictures representedby the light beam Lb3, the light beam Lb4 and the light beam Lb5 in thesame image may be generated by displaying the pictures represented bythe light beam Lb3, the light beam Lb4 and the light beam Lb5 bydifferent sub-pixels, thereby making the eye 1021 focus on theaccommodation point Ap1.

In the example (ii) of FIG. 10, a sub-pixel Px8, a sub-pixel Px9, asub-pixel Px10, a sub-pixel Px11, a sub-pixel Px12, a sub-pixel Px13 anda sub-pixel Px14 of the display 100 may respectively emit a light beamLb8, a light beam Lb9, a light beam Lb10, a light beam Lb11, a lightbeam Lb12, a light beam Lb13 and a light beam Lb14 to a view point VP8,a view point Vp9, a view point Vp10, a view point Vp11, a view pointVp12, a view point Vp13 and a view point Vp14 on a plane Pe where theeye 1021 is located. The light beam Lb8, the light beam Lb9, the lightbeam Lb10, the light beam Lb11, the light beam Lb12, the light beam Lb13and the light beam Lb14 may focus on another accommodation point Ap2,and the position of the accommodation point Ap2 is different from theposition of the accommodation point Ap1.

Furthermore, the light beam Lb8, the light beam Lb9 and the light beamLb10 emitted by the sub-pixel Px8, the sub-pixel Px9 and the sub-pixelPx10 may enter the pupil 114 of the eye 1021 in different viewdirections. In other words, the eye 1021 may view the light beam Lb8,the light beam Lb9 and the light beam Lb10 emitted by differentsub-pixels at the same time. For example, an image provided by thedisplay 100 may include the pictures represented by the light beam Lb8to the light beam Lb14 at the same time, and the eye 1021 may view thepictures represented by the light beam Lb8, the light beam Lb9 and thelight beam Lb10 at the same time. Offsets included between the picturesrepresented by the light beam Lb8, the light beam Lb9 and the light beamLb10 in the same image may be generated by displaying the picturesrepresented by the light beam Lb8, the light beam Lb9 and the light beamLb10 by different sub-pixels, thereby making the eye 1021 focus on theaccommodation point Ap2.

As shown in FIG. 10, the images provided by the display 100 may havedifferent offsets through displaying different images (such as theimages including the light beams Lb1-Lb7 and the images including thelight beams Lb8-Lb14) by different sub-pixels (such as the sub-pixelsPx1-Px7 and the sub-pixels Px8-Px14), such that the fourth position ofthe accommodation plane Pa1 of the one eye in FIG. 9 may be adjusted.For example, the controller 108 may obtain the image information (suchas the information regarding offsets) for the display 100 through thealgorithm calculation. The controller 108 may transmit the display dataincluding the image information to the display 100, and the display 100may provide the image V1 according to the display data, therebyrealizing the display method of adjusting the accommodation plane of theone eye.

In addition, taking FIG. 10 as an example, the view point Vp1, the viewpoint Vp2, the view point Vp6 and the view point Vp7 (or the view pointVp11, the view point Vp12, the view point Vp13 and the view point Vp14)are located outside the pupil 114, and these view points (or thepictures corresponding to these view points) make the eye 1021 able toview the image while moving, that is to say, these view points increasethe dimension of the moving range of the eyes.

In the display method of the image of the present disclosure, theposition of the vergence plane of the two eyes may be different from theposition of the image by adjusting the position of the vergence plane.The first distance exists between the vergence plane of two eyes of theuser and the user, and the third distance exists between theaccommodation plane of one eye and the user when the user views theaugmented reality image. The second distance exists between the vergenceplane of two eyes and the user when the user views the object in theenvironmental scene. The user may clearly view the augmented realityimage and the object in the environmental scene at the same time, oruser's uncomfortable feeling may be effectively reduced by controllingthe first distance and the second distance within the range R1 of FIG.3. In addition, the uncomfortable feeling of the user caused by thevisual vergence-accommodation conflict may be mitigated throughcontrolling the first distance and the third distance within the rangeR2 of FIG. 5.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the disclosure. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. A display method of an electronic device,comprising: providing a first image by a display, wherein a firstvergence plane of two eyes of a user is located at a first position whenthe user views the first image; and providing a second image by thedisplay, wherein the first image, the second image and an environmentalscene are located within a field of view of the user, and a secondvergence plane of the two eyes of the user is located at a secondposition when the user views the second image, wherein a first distanceexists between the first position of the first vergence plane and theuser, a second distance exists between the second position of the secondvergence plane and the user, and the first distance is different fromthe second distance.
 2. The display method of the electronic deviceaccording to claim 1, wherein the first image and the second image aredisplayed by different regions of the display.
 3. The display method ofthe electronic device according to claim 2, wherein one of the two eyesof the user focuses on a first accommodation plane when the one of thetwo eyes of the user views the first image, the one of the two eyes ofthe user focuses on a second accommodation plane when the one of the twoeyes of the user views the second image, and a position of the firstaccommodation plane is different from a position of the secondaccommodation plane.
 4. The display method of the electronic deviceaccording to claim 1, wherein the display provides the first image at afirst time point and the second image at a second time point, and thefirst time point is different from the second time point.
 5. The displaymethod of the electronic device according to claim 4, wherein one of thetwo eyes of the user focuses on a first accommodation plane when the oneof the two eyes of the user views the first image, the one of the twoeyes of the user focuses on a second accommodation plane when the one ofthe two eyes of the user views the second image, and a position of thefirst accommodation plane is different from a position of the secondaccommodation plane.
 6. The display method of the electronic deviceaccording to claim 1, the first distance is greater than the seconddistance.
 7. The display method of the electronic device according toclaim 6, wherein a third vergence plane of the two eyes is located at athird position when the user views an object in the environmental scene,wherein a third distance exists between the third position of the thirdvergence plane and the user, and the first distance and the thirddistance satisfy a first relation:Dn<D1<Df, wherein D1 represents the first distance, Dn=D3+Δn, andDf=D3+Δf, wherein D3 represents the third distance,Δn=(De/2)*{tan[tan⁻¹(2*D3/De)−δ]}−D3, andΔf=(De/2)*{tan[tan⁻¹(2*D3/De)+δ]}−D3, and wherein De represents adistance between the two eyes, δ represents an eye angular resolution ofthe two eyes, and δ=0.02 degrees.
 8. The display method of theelectronic device according to claim 1, wherein the display comprises aliquid crystal.
 9. The display method of the electronic device accordingto claim 1, wherein the display comprises a light emitting diode. 10.The display method of the electronic device according to claim 1,wherein the electronic device is applied to a vehicle.
 11. The displaymethod of the electronic device according to claim 1, further comprisingproviding a glass, wherein the glass is disposed between the user andthe environmental scene.
 12. The display method of the electronic deviceaccording to claim 11, wherein the glass comprises a windshield.
 13. Thedisplay method of the electronic device according to claim 11, whereinthe first image and the second image are projected onto the glass. 14.The display method of the electronic device according to claim 13,wherein the electronic device comprises an optical element, and thefirst image and the second image are projected onto the glass throughthe optical element.
 15. The display method of the electronic deviceaccording to claim 14, wherein the optical element comprises a mirror ora lens.
 16. The display method of the electronic device according toclaim 1, wherein the electronic device comprises a first sensingelement.
 17. The display method of the electronic device according toclaim 16, wherein the first sensing element comprises an eye trackingsensor, a head tracking sensor or a feature tracking sensor.
 18. Thedisplay method of the electronic device according to claim 16, whereinthe electronic device further comprises a second sensing element. 19.The display method of the electronic device according to claim 18,wherein the second sensing element comprises a camera, a light fieldcamera, a structure light camera, a feature detector or a lidar.
 20. Thedisplay method of the electronic device according to claim 1, whereinone of the two eyes of the user focuses on a first accommodation planewhen the one of the two eyes of the user views the first image, aposition of the first accommodation plane is different from the firstposition of the first vergence plane.